#include <stdio.h>
#include <ctype.h>
int main(int argc, char const *argv[])
{
	int i;
	char ch[50]={'a','d','s','1','9',[4]'i',[10]'8','w','a'};
	for (i = 0; i < 50; ++i)
	{
		if (isalnum(ch[i]))
			putchar(ch[i]);
		else
			putchar('_');
	}
	putchar('\n');
	return 0;
}